In your head, you should be able to add 15 and 5. The answer is 20. You should also be able to work out 20 + 9. The answer is 29. The trick to doing well at these types of questions is finding the quickest and easiest method of working them out. It will come with practice :)
Answer:
I'm notttt sureeeeee I think its C i don't know,
It is 70% Because:
250/100 + 175/x
Proportions
inaccurate
3 less than would be x-3, but 3-x would be 3 more
